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    STP1169

    Characterization of the Damping Properties of High-Damping Alloys

    Published: 01 January 1992


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    Abstract

    Techniques and strategies to characterize the damping properties of high-damping metals from two of the major classes of damping mechanisms are described. Two types of high-damping metals were chosen for the study: a series of die cast zinc-aluminum alloys that exhibit predominantly amplitude-independent, thermally activated damping mechanisms and a manganese-copper (Mn-Cu)-based alloy casting that exhibits pronounced amplitude-dependent damping together with thermally activated damping. It is shown that the damping behavior of the zinc-aluminum alloys can be described semi-empirically over the ranges of temperature and frequency useful in practical applications. In contrast, a similar description of the damping behavior of the Mn-Cu alloy is not possible because of the change in amplitude-dependent damping with frequency and the variation of damping with microstructural changes from place to place in the casting.

    Keywords:

    high-damping metals, high-damping alloys, amplitude-dependent damping, amplitude-independent damping, thermoelastic damping, internal friction, dynamic elastic modulus, dynamic stiffness, internal stress, material damping, mechanical properties


    Author Information:

    Ritchie, IG
    Senior scientist and scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba

    Pan, Z-L
    Senior scientist and scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba


    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP17959S